Refactor intra-strip panel drags by introducing PanelDragController.

chrome/browser/ui/panels/panel.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_PANELS_PANEL_H_
 #define CHROME_BROWSER_UI_PANELS_PANEL_H_
 #pragma once
 
 #include "chrome/browser/ui/browser_window.h"
 
@@ skipping 215 matching lines @@
   // Moves the panel to the |new_strip|, removing the panel from its
   // current strip.
   void MoveToStrip(PanelStrip* new_strip);
 
   ExpansionState expansion_state() const { return expansion_state_; }
   ExpansionState old_expansion_state() const { return old_expansion_state_; }
   const gfx::Size& min_size() const { return min_size_; }
   const gfx::Size& max_size() const { return max_size_; }
   bool auto_resizable() const { return auto_resizable_; }
 
-  bool draggable() const { return draggable_; }
-  void set_draggable(bool can_drag) { draggable_ = can_drag; }
+  bool draggable() const;
 
   // The restored size is the size of the panel when it is expanded.
   gfx::Size restored_size() const { return restored_size_; }
   void set_restored_size(const gfx::Size& size) { restored_size_ = size; }
 
   // Panel must be initialized to be "fully created" and ready for use.
   // Only called by PanelManager.
   bool initialized() const { return initialized_; }
   void Initialize(const gfx::Rect& bounds);
 
@@ skipping 61 matching lines @@
   // This is the minimum size that the panel can shrink to.
   gfx::Size min_size_;
 
   // This is the size beyond which the panel is not going to grow to accomodate
   // the growing content and WebKit would add the scrollbars in such case.
   gfx::Size max_size_;
 
   // True if this panel auto resizes based on content.
   bool auto_resizable_;
 
-  // True if this panel can be dragged.
-  bool draggable_;
-
   // Platform specifc implementation for panels.  It'd be one of
   // PanelBrowserWindowGtk/PanelBrowserView/PanelBrowserWindowCocoa.
   NativePanel* native_panel_;  // Weak, owns us.
 
   ExpansionState expansion_state_;
   ExpansionState old_expansion_state_;
 
   // Indicates whether the panel app icon is visible in the taskbar.
   bool app_icon_visible_;
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(Panel);
 };
 
 #endif  // CHROME_BROWSER_UI_PANELS_PANEL_H_